Single Sign On in MashZone : Complete scenario with using the enterprise umc

I study the possibility of configuring for a customer his SSO without the use of the umc MashZone .
My wish is to use directly the umc of my customer and MashZone keeps the checks concerning the key of connection.

Could you tell me if this scenario is possible ?
Are we obliged to use the umc MashZone for the checks of the right(straight) users?

MashZone's embedded UMC/Administration is needed to check the authorization of user trying to login, the product license assigned to that user account and the access privilege on available dashboards. This can't be outsourced.